The oldest (maybe) swimming pool in Iceland is a stunning oasis built into the side of a lush hill.

A stratovolcano located in the south of Iceland, with a long history of charted activity and a rich mythology attached.

The most powerful waterfall in all of Europe.

Michael Heizer's masterwork in the Nevada Basin.

Many generations of travelers have passed through the steep, smooth walls of this canyon.

A unique solar-powered pottery studio and gallery in the desert.

A former utopian healing center created by a huckster and built by derelicts.

An ornate century-old elevator still connects the two halves of Bad Schandau.

Nearly 300,000 acres of wildlife, natural splendor, and a hidden ghost town have been designated a national monument.

One of the most remote spots in America and the first protected wilderness area in Nevada, named after an old legend.

Big gun installations, built over a massive cemetery, now abandoned & hidden in trees.

This concrete tangle of square pipes has stood as a proud thorn in the city's side since the '70s.

Get lost in this haunting fairytale art walk through a man-made eucalyptus grove.

If you want to take a peek at Area 51, this is legally as close as you're going to get.

Mine your own precious stones.

The seawater playground of gilded-era San Francisco burned to the ground in 1966.

A tiny theater hidden in an alley plays a constant stream of short silent films for anyone willing to peer through the peephole.

A winding path built in secret on the edge of the continent.

The only theatre in the world constructed specifically for sound movement.

A psychedelic labyrinth on the San Francisco bay.

An artsy hidden staircase leads to breathtaking views of San Francisco.

A huge musical instrument played by the ocean.

World's largest collection of serial killer artwork and other macabre exhibits.

This peaceful garden is hidden on the grounds of a spiritual organization founded by a pioneer yogi.